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The circular shape and the connecting cable form an inductor (the cable around the magnetic ring is used as an inductance coil), which is often used in anti-interference components of electronic circuits and has a good shielding effect on high-frequency noise, so it is called absorbing copper, because iron is often used Ferrite material, let’s talk about ferrite beads (hereinafter referred to as round beads). The top of the figure is an integrated magnetic ring, and the bottom is a magnetic ring with mounting clips. The magnetic ring has different impedance characteristics at different frequencies. Generally, the impedance is very small at low frequencies. When the signal frequency rises, the impedance of the magnetic ring increases sharply. The effectiveness of inductance is well known. The higher the signal frequency, the easier it is to radiate. Generally, there is no shielding layer in the circuit, and the antenna with good signal can receive various clutter high-frequency signals from the surrounding environment. Changed the transmission of useful signals and seriously interfered with the normal operation of electronic equipment, so the electromagnetic interference (EM) of electronic equipment must be reduced. Under the action of the magnetic ring, even if the normal useful signal passes smoothly, the high-frequency interference signal can be well suppressed, and the cost is low. Color ring inductance

Inductance also plays an important role in signal shielding, noise filtering, current stabilization and electromagnetic interference suppression.

1. Classification of inductance:

Classified by working frequency

Inductors can be divided into high-frequency inductors, intermediate-frequency inductors and low-frequency inductors according to their operating frequency.

Air-core, magnetic-core and copper-core inductors are generally medium-frequency or high-frequency inductors, while iron-core inductors are mostly low-frequency inductors.